Corrosion Inhibition Performance of Methionine for CO2 Absorption Plants

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dc.contributor.advisorVeawab, Amornvadee
dc.contributor.authorUdayappan, Balaji
dc.contributor.committeememberNg, Kelvin Tsun Wai
dc.contributor.committeememberAroonwilas, Adisorn
dc.contributor.externalexaminerMuthu, Jacob
dc.date.accessioned2021-12-14T15:55:05Z
dc.date.available2021-12-14T15:55:05Z
dc.date.issued2021-03
dc.descriptionA Thesis Submitted to the Faculty of Graduate Studies and Research In Partial Fulfillment of the Requirements for the Degree of Master of Applied Science in Process Systems Engineering, University of Regina. xix, 138 p.en_US
dc.description.abstractInorganic corrosion inhibitors including heavy metals have been widely used in the carbon dioxide (CO2) absorption process for corrosion control. However, they are not environmentally friendly causing costly handling and disposal costs. This work therefore evaluated corrosion inhibition performance of an organic amino acid compound, namely Methionine (MTI) which is less toxic, more readily biodegradable, and has lower potential for bioaccumulation in aquatic organisms compared to common amine absorption solvents. The evaluation was experimentally implemented using electrochemical and weight loss methods. Carbon steel (CS1018) and 5.0 kmol/m3 Monoethanolamine (MEA) purged with 85% CO2 and 15% oxygen (O2) were used as tested material and absorption solution, respectively. The electrochemical results showed that at solution temperatures up to 80oC, MTI effectively reduced corrosion rates of CS1018 with maximum inhibition efficiencies of 83.56% ± 1.82% under a static condition (0 rpm) and 74.96% ± 0.95% under a dynamic condition (1500 rpm). Its inhibition performance was found to increase with inhibitor concentration and solution temperature but decrease with rotational speed. MTI acted as a mixed-type inhibitor and exhibited pitting tendency. The optimal MTI concentrations were 1500 ppm at 0 rpm and 2000 ppm at 1500 rpm. The post data analysis involving adsorption isotherm and activation thermodynamic properties revealed that MTI protected metal surface by undergoing spontaneous and endothermic physical adsorption. Its adsorption characteristic matched well with the Langmuir adsorption isotherm, thereby suggesting that MTI formed a protective monolayer on the metal surface. The results of quantum chemical analysis suggested MTI has higher affinity, polarizability, and electron donating ability than MEA. III The results of weight loss experiments carried out for up to 28 days showed that at 120oC, 5 bar and 1500 rpm, MTI was able to reduce corrosion rates of CS1018 to below 1 mmpy. The inhibition efficiencies were up to 78.7% for carbon steel specimens fully immersed in the MEA solutions, 53.5% for those partially immersed in the MEA solution and partially exposed to vapor, and 85.6% for those fully exposed to vapor. Pits were observed on carbon steel specimens fully immersed in both uninhibited and MTI inhibited solutions.en_US
dc.description.authorstatusStudenten
dc.description.peerreviewyesen
dc.identifier.tcnumberTC-SRU-14512
dc.identifier.thesisurlhttps://ourspace.uregina.ca/bitstream/handle/10294/14512/Udayappan_Balaji_MASC_PSEN_Fall2021.pdf
dc.identifier.urihttps://hdl.handle.net/10294/14512
dc.language.isoenen_US
dc.publisherFaculty of Graduate Studies and Research, University of Reginaen_US
dc.titleCorrosion Inhibition Performance of Methionine for CO2 Absorption Plantsen_US
dc.typeThesisen_US
thesis.degree.departmentFaculty of Engineering and Applied Scienceen_US
thesis.degree.disciplineEngineering - Process Systemsen_US
thesis.degree.grantorUniversity of Reginaen
thesis.degree.levelMaster'sen
thesis.degree.nameMaster of Applied Science (MASc)en_US
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